给我写一个安卓代码来接入arduino显示数据

好的，以下是一个简单的安卓代码示例，用于接入Arduino并显示数据：

首先，你需要在你的安卓项目中添加以下依赖项：

implementation 'com.android.support:design:28..'
implementation 'com.android.support:appcompat-v7:28..'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation 'com.android.support:support-v4:28..'
implementation 'com.android.support:recyclerview-v7:28..'
implementation 'com.android.support:cardview-v7:28..'

然后，你需要在你的布局文件中添加一个TextView，用于显示从Arduino接收到的数据：

<TextView
android:id="@+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="24sp"
android:textColor="@android:color/black"
android:gravity="center"/>

接下来，你需要在你的活动中添加以下代码，用于连接到Arduino并接收数据：

private BluetoothAdapter mBluetoothAdapter;
private BluetoothSocket mBluetoothSocket;
private InputStream mInputStream;
private OutputStream mOutputStream;
private TextView mTextView;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

mTextView = findViewById(R.id.textView);

// 获取蓝牙适配器
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

// 检查蓝牙是否可用
if (mBluetoothAdapter == null) {
Toast.makeText(this, "蓝牙不可用", Toast.LENGTH_SHORT).show();
finish();
return;
}

// 检查蓝牙是否已启用
if (!mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
} else {
connectToArduino();
}
}

private void connectToArduino() {
// 获取已配对的蓝牙设备
Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
if (pairedDevices.size() > ) {
for (BluetoothDevice device : pairedDevices) {
if (device.getName().equals("Arduino")) {
// 连接到Arduino
try {
mBluetoothSocket = device.createRfcommSocketToServiceRecord(MY_UUID);
mBluetoothSocket.connect();
mInputStream = mBluetoothSocket.getInputStream();
mOutputStream = mBluetoothSocket.getOutputStream();
Toast.makeText(this, "已连接到Arduino", Toast.LENGTH_SHORT).show();
startReceivingData();
} catch (IOException e) {
Toast.makeText(this, "无法连接到Arduino", Toast.LENGTH_SHORT).show();
finish();
return;
}
}
}
}
}

private void startReceivingData() {
new Thread(new Runnable() {
@Override
public void run() {
byte[] buffer = new byte[1024];
int bytes;

while (true) {
try {
bytes = mInputStream.read(buffer);
final String data = new String(buffer, , bytes);
runOnUiThread(new Runnable() {
@Override
public void run() {
mTextView.setText(data);
}
});
} catch (IOException e) {
break;
}
}
}
}).start();
}

private static final UUID MY_UUID = UUID.fromString("00001101-000-100-800-00805F9B34FB");
private static final int REQUEST_ENABLE_BT = 1;

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_ENABLE_BT) {
if (resultCode == RESULT_OK) {
connectToArduino();
} else {
Toast.makeText(this, "蓝牙未启用", Toast.LENGTH_SHORT).show();
finish();
}
}
}

最后，你需要在AndroidManifest.xml文件中添加以下权限：

<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>

这样，你就可以连接到Arduino并显示从它接收到的数据了。